some customer have ideas with our miniv2 board, they feel it is not powerful enough , so we have to find newway to resolve it. we select TDA8954th chip ,and use same PCB board as miniv2, try the test many times, at last tda8954th chip works well and delivery out enough power with this little module.
Highlight :
1. single chip SMPS can delivery out 600W power at good fan cooling sysytem , only change some parts value compared with miniv2 board.
2.TDA8954TH pin 10 pin11 pin 12 solederless, works very well at +/-40v conditions.
3. It have headspace with dc voltage, we use +/-40v dc and it can delivery out 2*150W@4ohm and 300W@8ohm with 0.5% THD.
4. Good protection circuit inside chip and more excellent protect circuit outside chip, works stable.

we have manufactured several hundreds units in stock now , if like ,send mail to us. if use it in PA amp , we can provide nice PA transofrmers, 180W rms power and have 70v 100v 120v output voltage output. transformers price 11usd/set, include screw and clip and others.

Finally we finish our latest tda8950 class D amp, integrated our newer single chip resonant half bridge SMPS. we have tested it for some days, pass our test and works well.it is the most stable tda8950 module from us from now.we will assemble it to our original G300X amp.

MINIv2 FEATURES:
• TDA8950TH Hi-Fi class D chip inside
• Stage based on the new type high stability class d circuit
• An High efficiency Series-resonant switch power supply inside
• A wide set of features for plug and play implementation into applications such as home theatre and other hi-fi amp equipment
•Easy using,BTL/SE jumped by one soldering point
•Auxiliary preamp power inside .+/-15V@200mA max and +5V@200mA(linear regulator)
•Auto clip detect and revise function.
•Output PWM LED indicator function.

I'm interested in the G300V30 or MiniV2en both as ready made amps in aluminium body. And I can't believe I missed out on the G36D for $400, I would have bought it at that price in a second, but I can't afford the current price unfortunately. Great job with the latest amps sinewave!

My G36D arrived at last.
I am using it in four channel mode with coax input and like the sound though I must admit I wouldn't win a competition for discerning ears.
There was a potentially serious fault in the installation of the speaker terminal blocks, where loosening the terminals allows the blocks to flop around and contact the chassis. Not a problem if using banana plugs and its easy enough to open the case and tighten things properly.
Otherwise a nice unit.

I would like to order one when they are ready to ship. If you can provide a picture of the production board to show that they are ready, that would be wonderful. Thanks!

Also, re: testing, I recommend the following:
1) Build two virtual speaker loads to simulate a 4 ohm speaker, with a 0.1 mH inductor (high power rating) in series with two 200W 8 ohm power resistors in parallel, mounted to a heat sink with a fan for cooling.
2) Connect the virtual speaker loads, one to each channel of the amp.
3) Run at 50% of rated power for 30 minutes. A good signal for this would be a 1 second 20 Hz to 20 kHz sine wave sweep with a 1 second gap in between each sweep to allow the amplifier and load resistors to cool.
4) If the amplifier doesn't finish the test, or makes a strange sound or smell or smoke, then it should not be sent to the customer, and should be taken apart. Inspect the amplifier board to find out what component failed. This will help improve the design for better reliability.

I have a G250V21 amplifier that works great, but I have an older G300V21 amplifier that has burned up. If the consistency and quality can be improved, then these will be great products. I am hoping that the G300V30 amp board will be better.

__________________If it works, but you don't know why it works, then you haven't done any engineering.Taterworks Audio (nothing for sale)

I would like to order one when they are ready to ship. If you can provide a picture of the production board to show that they are ready, that would be wonderful. Thanks!

Also, re: testing, I recommend the following:
1) Build two virtual speaker loads to simulate a 4 ohm speaker, with a 0.1 mH inductor (high power rating) in series with two 200W 8 ohm power resistors in parallel, mounted to a heat sink with a fan for cooling.
2) Connect the virtual speaker loads, one to each channel of the amp.
3) Run at 50% of rated power for 30 minutes. A good signal for this would be a 1 second 20 Hz to 20 kHz sine wave sweep with a 1 second gap in between each sweep to allow the amplifier and load resistors to cool.
4) If the amplifier doesn't finish the test, or makes a strange sound or smell or smoke, then it should not be sent to the customer, and should be taken apart. Inspect the amplifier board to find out what component failed. This will help improve the design for better reliability.

I have a G250V21 amplifier that works great, but I have an older G300V21 amplifier that has burned up. If the consistency and quality can be improved, then these will be great products. I am hoping that the G300V30 amp board will be better.

Hi! Taterworks,appreciate your suggestion here, thanks.

G300v30 module have update one time, and latest version is g300v31, it have good specs than g300v21:

1. full 400W rms power out one module.2. Half bridge LLC power supply high efficiency and constant 50v dc output .3.Shield output inductor and very few influence to radio.4.Stereo output, 2x200W/4ohm@0.5%THD+N5.Four layer PCB design, good performance.

we test it with 4ohm/500w resister and source is 1kHz sinewave signal, we test it with full power level ,of course good fan cooling system necessary.
we have not test it with your suggested virtual speaker loader, but we can test it with it soon.

about G300V21 , it is 150W/4ohmX2 output , but it supplied 49v dc power, so they can delivery out 300W/4ohmx2 with short time, we use quasis resonant Flyback SMPS as power supply, it can delivery out 300W power max, so we think it SMPS weak and maybe problems occured at some conditions.

We haven't been shouting to push the sale of our g300v31 module products here, because very busy from last year to now,we have to set up new factory in middle china and find better way to control our products quality. you know it is hard work indeed.

We have to say sorry to our friends,most of our sample supply delayed from last year to now,45-60days normal.pls understand us.

we will try our best to make our products quality better and quantity more .

Thank you for the updated information on the G300 product, and for the new photos of the G300V31 board. Please provide an update when the new G300V31 amplifier modules are available to ship. I would like to replace the G300V21 module I have that failed with the newer G300V31 board for testing.

Regarding my recommendation of an inductive virtual speaker load: The reason to create a virtual speaker load for testing class-D amplifiers is because a real speaker provides an inductive load for the amplifier, unlike a resistor which is almost purely resistive. The virtual speaker load adds a small series inductor to provide the inductance. This helps the output filter provide more extended bandwidth for the amplifier output. I hope this information helps your testing process.

__________________If it works, but you don't know why it works, then you haven't done any engineering.Taterworks Audio (nothing for sale)